Effect of bur type and conditioning on the surface and interface of dentine

Department of Cariology, Restorative Sciences and Endodontics, University of Michigan, 1011 N. University D2361, Ann Arbor, MI 48109-1078, USA.
Journal of Oral Rehabilitation (Impact Factor: 1.68). 11/2005; 32(11):849-56. DOI: 10.1111/j.1365-2842.2005.01507.x
Source: PubMed


The purpose of this in vitro study was to evaluate the surface and resin-dentine interface characteristics of permanent tooth dentine cut with diamond or carbide burs and treated with phosphoric acid (PA) or an acidic conditioner. Labial surfaces of permanent incisors were prepared into dentine with high-speed carbide or diamond burs and divided into two halves. Phosphoric acid 36% was applied on one half and non-rinse conditioner (NRC) was applied on the other half. Ten randomly selected scanning electron microscopy (SEM) fields from each specimen (n = 15) were evaluated. Occlusal surfaces of third molars were divided in two halves for evaluation of the resin-dentine interface. The halves were randomly assigned to one of each conditioner and restored with Prime & Bond NT/Spectrum. Ten specimens were analysed by SEM to evaluate hybrid layer formation and interfacial seal. We observed that surfaces prepared with carbide bur presented less residual smear plugs (P < 0.05) than surfaces prepared with diamond burs. Surfaces conditioned with NRC, which is a smear layer modifier, presented more residual smear plugs than surfaces conditioned with PA (P < 0.05). Treatment with PA resulted in more sealed interfaces than specimens treated with NRC. Within the limitations of this study the results showed that carbide burs leave a surface that is more conducive to bonding than diamond burs.

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    • "Its thickness can generally be classified in descending order according to the following ranking: median-grit diamond bur > fine-grit diamond bur > tungsten carbide bur > #600-grit SiC paper.[8] [26] [27] In addition, the smear layer produced by the diamond burs seems to be more porous than that produced by abrasive paper or carbide bur.[8] [26] [27] Interestingly, despite all of these variations, the bond strength of most SLCs evaluated in this study was not significantly influenced. "
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